Silas Justiniano wrote:
> Sorry, I'll remake (rewrite? redo? ... bad English :/ ) my question:
>
> I have Books, Authors and Intermediate table. At intermediate I'm
> currently using the following indexes:
>
> CREATE INDEX authorIndex ON Intermediate(author_id);
> CREATE INDEX bookIndex ON Intermediate(book_id);
>
> I need a third index to not allow duplicated data in my table:
>
> CREATE UNIQUE INDEX blablabla ON Intermediate(author_id, book_id);
>
> I'd like to know if, using the third index I can delete one of the
> first. Maybe both?
You can probably delete authorIndex without impacting performance too much.
--
Richard Huxton
Archonet Ltd